Exactly______ the potato was introduced into Europe is uncertain, but it was probably around 1565.
| A．whether | B．why | C．when | D．how |
相关试题
-- Could I have a word with you?
-- Sorry, I am busy ________．Shall we do it later?
| A．at the moment | B．for a momentk+s-5#u |
| C．the moment | D．in a moment |
I tried hard to get some information about the new technology out of his mouth, but he remained ．
| A．quiet | B．still | C．silent | D．calm |
got on the train when it began to move．
| A．No sooner had I | B．I had no sooner |
| C．Hardly had I | D．I hardly had |
--How about your journey to Mount Emei?
--Everything was wonderful except that our car _________ twice on the way．
| A． | slowed down | B． | broke down |
| C． | got down | D． | put down |
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